I just installed the package on arch linux running the 5.3.11 kernel, however no fonts are being rendered in the program. If I hover around the header I can see submenus however none of the text is being rendered.

I thought I was stuck but Jakobchs comment helped me out. Apparently if BlueJ seems to be stuck loading it opens another window where you need to confirm something but the windows is too small to see something and not resizable. Just hit enter.

@chromanju can't reproduce, make sure you're using the latest PKGBUILDs (4.2.1-5 and 3.6.0-3), you have java11-openjfx installed, and your system is fully up to date. If you're still experiencing the issue please post the output of

$ pacman -Fl java11-openjfx

and

$ archlinux-java status

edit: about to update bluej to 4.2.2, would be best if you could test with this version

BlueJ still won't start resulting in these error(s); help required:
xception in thread "main" java.lang.NoClassDefFoundError: javafx/application/Application
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)

BTW: same problem with greenfoot
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at bluej.Boot.main(Boot.java:202)
Caused by: java.lang.ClassNotFoundException: javafx.application.Application
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)